久しぶりの emerge --update world

をしようと思ったらこんなのが出た。

These are the packages that would be merged, in order:

Calculating world dependencies |
!!! All ebuilds that could satisfy ">=gnome-base/control-center-2.20.1" have been masked.
!!! One of the following masked packages is required to complete your request:
- gnome-base/control-center-2.20.1 (masked by: required EAPI 1, supported EAPI 0)
- gnome-base/control-center-2.20.1-r1 (masked by: required EAPI 1, supported EAPI 0)

For more information, see MASKED PACKAGES section in the emerge man page or
refer to the Gentoo Handbook.
(dependency required by "gnome-base/gnome-2.20.1" [ebuild])

ぐぐってみると幸運にも割合知られた話だったみたいで、 portage 2.1.3.12 以上にすれば解決するっぽい。のでとりあえず portage を merge しなおしている。 -D つけたら依存が 50 以上あって、これ -D world なんてやったら明日の朝までに終わらない気配だなあ。